A motorist accused of causing the death of a taxi driver after she allegedly sped through a red light had stopped taking her medication after being seriously assaulted, a Melbourne court has heard.
Natasha Karishma Sanyasi, 33, is a "highly functioning" individual when she is taking her bi-polar medication, a barrister told a bail hearing on Wednesday.
She is seeking to be bailed to a private psychiatric hospital while she awaits prosecution for multiple driving offences and a drug possession charge.
Sanyasi is facing a maximum jail term of 20 years for the charge of culpable driving causing death.
Police allege she was travelling at 140km/h - double the speed limit - when she sped through a red light in Fawkner, smashing into Dilawer Shah's vehicle and killing him in the early hours of July 16.
They have opposed bail, saying the Oakleigh South woman is a danger to herself and the public, and poses an unacceptable risk of re-offending.
Sanyasi was found to have cannabis and three prescription drugs in her system following the crash, Senior Constable Andrew Coulson told the court on Wednesday.
She was travelling at an "excessive and grossly negligent" speed when she struck Mr Shah's car, he said.
Barrister Carmen Randazzo told the Melbourne Magistrates' Court Sanyasi - who has bi-polar disorder - had not been taking her medication when the fatal crash occurred.
"When she is stable and taking her medication she's a highly functioning person," Ms Randazzo said.
"She has no prior history, and that's in the context of someone who has had a serious mental disorder for a long time."
Ms Randazzo said Sanyasi had been non-compliant with her medication in the past, usually as the result of a "trigger".
The police case against Sanyasi had no regard to whether she was mentally unstable at the time of the crash, she argued.
"She was the victim of a serious assault," Ms Rendazzo said, adding if Sanyasi is bailed to a private psychiatric hospital, she could be monitored.
Police fear that as a voluntary patient, Sanyasi could simply walk out of the facility.
"We may have to post a police guard - and that is onerous," Sen Const Coulson said.
Mr Shah had just finished his shift and was on his way home when he was killed.
The hearing was adjourned until Thursday.